Hey, i am new to the forum.
Sorry to wake up the thread, but i am not sure if i get the concept of how to unlock the shaders.
This is what i think it should look like (noob style)
1. Get Shader unlocker (Mod_BIOS_HD_6950.rar), ATI Winflash and MSI AB 2.10 beta
2. Use Winflash to backup original bios from the card and copy .bin to Mod_BIOS_HD_6950 folder
3. Run the run.bat
4. Use Winflash again to flash the card with new, just modded, bios
5. Edit .cfg of the MSI AB and check those two boxes in AB settings
6. Raise Core Clock to 880, Memory Clock to 1375 and Core Voltage to 1.1V(1100mV). Or even more, but these values for exact same 6970 settings

I've flashed my XFX 6950 for a 2nd time . The first time I had heavy artifacting . Now I've found the post for voltage unlock and I'm afraid I must ask what will seem obvious to many . I've opened the cfg file andchanged the voltage control and voltage monitoring values to 1 . However I can't save the file - "access denied " the file already exists . Help me out if you could please . I've never tried o/c graphics cards only cpu's

I do not have access to my win 7 com at this time, but if that does not work, this is what worked for me:
1. Right click the file and go to properties.
2. Click on the security tab.
3. click the ADD button.
4. click the ADVANCE button
5. click on FIND NOW button and select your user name.
6. click OK and then give full access to it.

You should be able to save it then. To begin with, only SYSTEM has access to it. So you need to give access to admin or your user to update that file.

This is what I did. I set the switch to 2 and boot my comp (may not be necessary to do). Once my comp is up and running, I switched it to 1. Then I did the BIOS flash. And then reboot my computer. This time it reboot with bios switch at 1 and I got the unlocked shaders.
Just as a note, when I tried to run ATIwinflash out of windows, it was not able to erase ROM. So, I had to use it via command line and had to use the command to unlock the ROM. The instructions are here in this thread somewhere. If you are not sure how to do it via command line, let me know and I will dig up the instructions.